Improvement in hot-air furnaces



PATENT OFFICE.

CHARLES WOOD, OF WORCESTER, MASSACHUSETTS.

IMPROVEMENT IN HOT-AIR FURNACES. y

Specification forming part of Letters Patent No. 116,908, dated July 1l,1871.

To all whom it may concern:

Be it known that I, CHARLES Woon, of the city and county of Worcesterand State of Massachusetts, have invented certain new and usefulImprovements in Air-Heating Furnaces; and I do hereby declare thefollowing to be a full, clear,

' and exact description of the same, reference being had to theaccompanying drawing which forms a part of this specification.

Figure 1 represents a perspective view of my improved furnace. Fig. 2represents a longitudinal vertical section of the same, and Fig. 3represents a transverse vertical section of the same.

To enable those skilled in the art to'which my invention belongs to makeand use the same, I will proceed to describe it more in detail.

The nature of my invention consists in certain improvements inair-heating furnaces, as will be hereafter described.

In the drawing, the part marked A indicates the cold-air chamber, intowhich the external air is conveyed by suitably-arranged pipes or flues,which it is not necessary to herein illustrate. B indicates the hot-airchamber into which the air is passed when heated. C indicates the outeror inclosing-wall of the furnace, and D D indicate the Walls whichseparate the fire-passages E, F, and G from the cold and hot-airchambers A and B. Hv indicates the top plate of the furnace, and I theupper plate of the fire-passage E. The air is conveyed from the coldchamber A, after it has entered the opening a in the outer wall C, tothe hot chamber B through ranges of tubes J, arranged inthelire-passages, and also through spaces K between the plates L M and N O,which separate the fire-passages E, F, and Gr from each other. N

In furnaces of this class, as heretofore constructed, the tubes J andplates L M N O have all been laid in a horizontal position; but in myimproved furnace I arrange the tubes and platesinan inclined position,the ends thereof,

' which are 'fixed in the wall D at the side of the hot-air chamber,being considerably higher than the ends which are fixed in the wall D atthe cold-air chamber. By inclining the tubes J and plates L M N O theair is caused to pass through from the cold to the hot-air chamber in amuch stronger and more uniform current, so that a greater quantity ofair can be heated with a given amount of fuel than with the ordinaryfurnace of this class having horizontal tubes and plates.

Another great advantage gained by the inclined plates and tubes is thatthey are much easier kept free from soot and ashes than those which areset horizontal. The action of the draught across them tends to agitatethe particles of soot deposited upon the plates and causes them tosettle at the lower edge thereof, and to leave the greater portion ofthe plate surface comparatively free from deposit. The collection ofsoot and ashes at the lower edges of the plates can readily be removedthrough small openings which can be arranged for that purpose in thewall at vthe end of the furnace.

Upon the top of the furnace, directly above the fire-pot or grate Q, Iarrange a delivering-dome, P, from which the hot-air flues R extend tothe various apartments to be heated. The lower part ofthe dome I) isopen into the l1 ot-air chamberB, and the air, after passing through thedifferent tubes and passages J K, and becoming heated to variousdegreesof temperature, rises into the dome l. and there mingles, so thatthe mass is brought to a uniform temperature before being transferred tothe apartments through the ilues R. It will be observed that therelative arrangement of the fire-pot or grate Q, air-flues J, anddeliveringdome .P issuch that the heated air and gases from the firepass in such a direction as to impinge against the sides of the tubes oriiues J, and also againstthe bottom of the upper plate I which forms thebottom of the dome l?. The various walls of the furnace may be built ofany suitable material, but I prefer to make the tubes and plates ofmetal.

Having thus described my improved air-heatin g furnace, what I claimtherein as new and of my invention, and desire to secure by LettersPatent, is-T 1. The relative arrangement of the inclined air-tubes J,air-chambers A B, and walls D D substantially as and for the purposesset forth.

2. The relative arrangement of the fire-pot or grate Q, and dome I), asrespects each other, and

the cold and hot-air chambers A and B, with their connectingtubes,substantially as shown and described.

3. The relative arrangement ofthe inclined airtubes J, anddivision-plates L M N O, as shown and described.

WVitnesses YY.lrrosl. DODGE,

A. E. PEIRGE.

cnAnLEs woon.

